body{
    background-color: red;
}
div{
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 500px;
    height: 500px;
    background-color: black;
}
div{
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 1000px;
    height: 1000px;
    background-color: orange;
}